21. Music in the Workplace Before contracting to have music piped into each of his suites of offices, an executive randomly selected seven offices and had the system installed. The average time

(in minutes) spent outside these offices per excursion among the employees involved was recorded before and after the music system was installed with the following results.

Would you suggest that the executive proceed with the installation? Conduct an appropriate test of hypothesis.
Find the approximate p-value and interpret your results.

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Office Number 1 2 3 4 5 6 7 No Music Music 8 5 96 9 5 6 5 10 7 7 5 6 7 8